I use an ESCORT REDLINE detector and have been very happy with it up until yesterday when I got a speeding ticket. I had the detector in my car and was in a hurry. Nothing new there. I was ambushed by a pair of police officers hiding behind a large digital information sign. The kind that advises you of pending road construction and such. My REDLINE did not make a peep. After talking to ESCORT today they said that the beam sent out by the LASER gun can be as small as two feet in diameter and if the beam does not actually hit the detector then the detector will not respond.
ESCORT's only advice was to get a laser shifter. ESCORT also said that portable detectors all have limitations. Small consolation. I guess I/we still need to rely on our "spider sense". As much as I hate to say, the cops had picked a great spot for their ambush - in a bend, in the shade, and hiding their cruisers well out of sight and using the sign as a further distraction. I was the April fool.